American standard wall hung 4040 tank/white

Mine has a crack and needs to be replaced to sell my house. I also have two other that needs new seats. All three are original to the house from 1967. the colors are white, blue, and beige. Any help on where to get parts would be appreciated. Another option is to find a replacement but I'm not sure about the bolt pattern lining up. Thanks

It's the same bolt pattern, you have to check the threaded rod coming from the carrier to see if they are adjusted out to the right length.
You can normally loosen the nut and spin them in or out.
Remember to save all the acorn nuts, washer and backing nuts.
The bowl should be out from the wall about the width of a flat washer. The bowl doesn't touch the wall, it snugged up against the backing washers and nuts.
You can only tighten three nuts, the fourth is hand snugged. If you wrench tighten the fourth nut, you will be buying a new bowl.